#!/usr/bin/env python
# -*- coding:utf-8 -*-
# @FileName  :calculator_25.py
# @Time      :2020/6/22 16:06
# @Author    :Administrator


# 定义函数
def add(x, y):
    """相加"""
    return x + y


def subtract(x, y):
    """相减"""
    return x - y


def multiply(x, y):
    """相乘"""
    return x * y


def divide(x, y):
    """相除"""
    return x / y


print('选择运算符:')
print('1、相加')
print('2、相减')
print('3、相乘')
print('4、相除')

choice = input('输入你的选择(1/2/3/4):')

num1 = int(input('请输入第一个数字：'))
num2 = int(input('请输入第二个数字：'))

if choice == '1':
    print(num1, '+', num2, '=', add(num1, num2))
elif choice == '2':
    print(num1, '-', num2, '=', subtract(num1, num2))
elif choice == '3':
    print(num1, 'x', num2, '=', multiply(num1, num2))
elif choice == '4':
    print(num1, '/', num2, '=', divide(num1, num2))
else:
    print('非法输入')
